City birds are using cigarette butts in their nests to reduce parasites, but the toxic tradeoff may come with hidden risks ...

It seems that by lacing their nests with cigarette butts, several species of birds have learned to keep pests and parasites away.

I’ve recently been doing surveys for Marin’s Breeding Bird Atlas project. The basic idea is this: divide the county up into 221 blocks of about 1,500 acres each, recruit skilled volunteer observers to ...